Stream data recording device, stream data recording/reproducing device, stream data reproduction device, stream data editing device, stream recording method, and stream reproducing method

a technology for stream data and recording devices, which is applied in the field of recording and playing back av stream data, can solve problems such as transmission errors, and achieve the effect of not causing discomfort or discord in users

Inactive Publication Date: 2013-12-10
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031]According to the above structure, when a portion is missing during stream data reception, the stream data recording apparatus of the present invention records time information specifying a length of a missing portion in the stream data and position information specifying a position of the missing portion in the stream data to a recording medium along with the stream data that is missing a portion. When playing back stream data that was recorded by the stream data recording apparatus of the present invention, even when a time in an unreceivable section or a time immediately following an unreceivable section and before the appearance of an IDR picture is specified as a seek time, the stream data recording device enables specifying a position where the unreceivable section ends and starting playback from the specified position, and preventing playback from being interrupted when reaching an unreceivable section a few seconds after the playback starts. Accordingly, playback in correspondence with a seek time can be performed without causing feelings of discomfort or discord in the user.

Problems solved by technology

In digital delivery of stream data, representative of which is digital broadcasting and Internet delivery, transmission signals include noise due to the influence of, for example, reflections off of buildings, and reflections in a network cable during signal transmission, which causes transmission errors.

Method used

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  • Stream data recording device, stream data recording/reproducing device, stream data reproduction device, stream data editing device, stream recording method, and stream reproducing method
  • Stream data recording device, stream data recording/reproducing device, stream data reproduction device, stream data editing device, stream recording method, and stream reproducing method
  • Stream data recording device, stream data recording/reproducing device, stream data reproduction device, stream data editing device, stream recording method, and stream reproducing method

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0091]FIG. 2 is a block diagram showing a structure of a stream data recording apparatus 201 pertaining to embodiment 1 of the present invention.

[0092]The stream data recording apparatus 201 includes a stream reception / analysis unit 101, a missing portion detection unit 102, a section information generation unit 103, a time counter unit 104, and a recording unit 105.

[0093]The stream reception / analysis unit 101 receives a digital broadcast signal from a tuner, and after performing demodulation processing and error correction processing and converting the digital broadcast signal to a TS, extracts and outputs TS packets that include a PID (Packet Identifier) that identifies a program designated for recording by a user.

[0094]In a TS, there are cases in which a PCR for performing synchronization between the sending side and the receiving side of a digital broadcast signal is reset at an arbitrary timing according to circumstances on the sending side, and the receiving side, as shown in ...

embodiment 2

[0170]The following describes a stream data recording / playback apparatus 204 of embodiment 2 that, in a case of simultaneously recording and playing back stream data after reception thereof, uses information obtained in the stream data playback process for stream data missing portion detection processing.

[0171]FIG. 23 is a block diagram showing a functional structure of a stream data recording / playback apparatus pertaining to embodiment 2.

[0172]In FIG. 23, structural elements that are similar to ones used in FIGS. 2, 14, and 15 have been given the same reference symbols, and description thereof is omitted.

[0173]The playback unit 116 in FIG. 23 is specifically, a decoder that demultiplexes the stream data for recording and playback acquired from the stream reception / analysis unit 101 into audio data and video data, and decodes the audio and video data. The playback unit 116 notifies the missing portion detection unit 102 of the occurrence of errors such as decoding errors and buffer ...

embodiment 3

[0179]If playback is performed in a case of a continuous reception section of short duration being sandwiched between unreceivable sections, the video will have frequent interruptions and it is possible for the user to feel discomfort. The following describes a stream data recording apparatus 205 of embodiment 3 that, in a case of a continuous reception section of short duration being sandwiched between unreceivable sections, updates section information to reduce discomfort during playback.

[0180]FIG. 24 is a block diagram showing a functional structure of a stream data recording apparatus pertaining to embodiment 3.

[0181]In FIG. 24, constituent elements that are similar to ones in FIGS. 2, 14, and 23 have been given the same reference symbols, and description thereof is omitted.

[0182]An unplayable judgment unit 121 acquires a sequence table including section information of unreceivable sections from the section information generation unit 103, and judges whether to actually play bac...

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PUM

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Abstract

A stream data recording device is provided for recording stream data on a recording medium. The stream data recording device includes a stream reception / analysis unit (101), acquiring stream data from reception data, a a missing portion detection unit (102) detecting a missing packet portion in the acquired stream data, a section information generation unit (103) generating time information specifying the duration of the unreceivable section including the packets whose missing portion has been detected and position information specifying the position of the unreceivable section in the stream data, and a recording unit (105) recording the acquired stream data, the generated time information and position information on the recording medium. Thus, even if the recording-target stream data is missing a portion during reception of the stream data, the data can be correctly played back from the seek time specified by a user.

Description

TECHNICAL FIELD[0001]The present invention relates to technology for recording and playing back AV stream data.BACKGROUND ART[0002]Stream data broadcasting for mobile reception terminals is being focused on as a technique to enable easy enjoyment of stream data such as audio and video at any place and time.[0003]Stream data that is broadcast in stream data broadcasts for mobile reception terminals include IDR pictures that can be played independently without referencing images before and after. When receiving and recording such stream data on a mobile reception terminal, for each IDR picture, the mobile reception terminal measures a stream time (hereinafter called an offset time) from the beginning of the stream data until playback of the IDR picture, generates index information, and records the index information along with the stream data. The index information correlates the measured offset time, an index number (hereinafter, called a TPI: Transport Packet Index) that indicates wh...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N5/94H04N5/00H04N7/24
CPCG11B20/10527G11B27/034G11B27/105G11B27/322G11B27/36H04N9/8042H04N9/8205H04N21/41407H04N21/4325H04N21/4334H04N21/44209H04N21/8455G11B27/34G11B2020/10537G11B2020/10916
Inventor HIRAYAMA, KAZUHIKOMIYAZAKI, AKIHIROFUCHIKAMI, MICHIKOMATSUI, NORIHIROMURAI, NOBUNARI
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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